I saw the video with the Portal world a user made; it was awesome. I think this is going to change the game a lot. If they implement something like JavaScrip, or even just a few Java libraries, users will be able to create incredible worlds. I know this is down the road a bit, if it ever comes, but with the programmable blocks, it should be a natural next step.

At the moment it is just for certain in-game commands, but they are being added to. Things like teleporting characters, giving them items, clearing their inventories, etc are all great as they can help run things like the http://www.theoldergamers.com/forum/...p-run-tf2.html.